Photoelectric safety screen with stray source detection

Details Photoelectric safety screen with stray source detection Photoelectric safety screen with stray source detection

1983-12-06

1985-05-28

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

340556, G01V 904

Patent

active

045202621

ABSTRACT:
This invention relates to safety apparatus intended for use in conjunction with industrial machinery especially of a type such as presses and guillotines. The invention employs a radiant energy safety screen with the ability to detect the presence of extraneous radiation or a failure of radiant energy sources or detectors.

REFERENCES:
patent: 3136926 (1964-06-01), Smith
patent: 3704396 (1972-11-01), MacDonald
patent: 3970846 (1976-07-01), Schofield
patent: 4243879 (1981-01-01), Carroll et al.
patent: 4247767 (1981-01-01), O'Brien et al.
patent: 4249074 (1981-02-01), Zettler et al.

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